Antenna-coupled spintronic terahertz emitters driven by a 1550 nm femtosecond laser oscillator

Nandi U, Abdelaziz MS, Jaiswal S, Jakob G, Gueckstock O, Rouzegar SM, Seifert TS, Klaeui M, Kampfrath T, Preu S (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Applied Physics Letters American Institute of Physics (AIP)

Book Volume: 115

Article Number: 022405

Journal Issue: 2

DOI: 10.1063/1.5089421

Abstract

We demonstrate antenna-coupled spintronic terahertz (THz) emitters excited by 1550 nm, 90 fs laser pulses. Antennas are employed to optimize THz outcoupling and frequency coverage of ferromagnetic/nonmagnetic metallic spintronic structures. We directly compare the antenna-coupled devices to those without antennas. Using a 200 μm H-dipole antenna and an ErAs:InGaAs photoconductive receiver, we obtain a 2.42-fold larger THz peak-peak signal, a bandwidth of 4.5 THz, and an increase in the peak dynamic range (DNR) from 53 dB to 65 dB. A 25 μm slotline antenna offered 5 dB larger peak DNR and a bandwidth of 5 THz. For all measurements, we use a comparatively low laser power of 45 mW from a commercial fiber-coupled system that is frequently employed in table-top THz time-domain systems.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI) DE Germany (DE) Technische Universität Darmstadt DE Germany (DE)

How to cite

APA:

Nandi, U., Abdelaziz, M.S., Jaiswal, S., Jakob, G., Gueckstock, O., Rouzegar, S.M.,... Preu, S. (2019). Antenna-coupled spintronic terahertz emitters driven by a 1550 nm femtosecond laser oscillator. Applied Physics Letters, 115(2). https://doi.org/10.1063/1.5089421

MLA:

Nandi, Uttam, et al. "Antenna-coupled spintronic terahertz emitters driven by a 1550 nm femtosecond laser oscillator." Applied Physics Letters 115.2 (2019).

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